[Hallicrafters] Solid state rectifier and matching 6V6s

[jeremy-ca]

----- Original Message ----- 
From: "Edward B Richards" <zuu6k at juno.com>
To: <gzook at yahoo.com>
Cc: <km1h at jeremy.mv.com>; <hallicrafters at mailman.qth.net>; 
<iluznst at yahoo.com>; <lrlayton at cox.net>
Sent: Sunday, September 09, 2007 12:00 PM
Subject: Re: [Hallicrafters] Solid state rectifier and matching 6V6s


> Hi Glen, et al;
>
> The R/S transformer you recommend is the one I use in my voltage reducer
> as described on BAMA's home page. It is center tapped and I separate the
> two outlets in as duplex outlet so one is connected to the center tap for
> 6.3 volt reduction, and the other to the end of the winding for 12.6 volt
> reduction. This gives one a choice for different line voltages and radio
> requirements. I house it in a 4" metal junction box with a matching
> cover. This will reduce the voltage without wasting electricity and
> heating up your room with a resistive element.


Only if you have managed to find a way to cancel the laws of physics. All 
your method does is convert resistive loss to inductive/core losses. The 
watts remains the same.

Maybe that part of basic theory was missing on your Extra ham exam.

Carl
KM1H






It also provides a
> constant voltage with different loads.

> I have one assembled and tested for sale at $39.95 including shipping.
> Thank you.
>
> 73,  Ed  K6UUZ
>
> On Sun, 9 Sep 2007 08:09:06 -0700 (PDT) Glen Zook <gzook at yahoo.com>
> writes:
>> Considering the cost of copper wire these days using a
>> filament transformer in a voltage "bucking" type
>> circuit will generally be much cheaper.  Remember that
>> the price of copper has gone up over 300% in the past
>> year, or so.
>>
>> From Mouser 18 gauge "zip" cord runs $342.71 for 1000
>> feet (no shorter lengths available).  Part number
>> 566-8888-1000-08 (Belden part number 8888).  However,
>> no 3rd wire ground is present with such wire and you
>> have to provide the ground for safety.
>>
>> Radio Shack sells a 3 amp 12.6 volt transformer for
>> $10.49 (part number 273-1511) and a 1.2 amp 12.6 volt
>> transformer for $8.39 (part number 273-1352).
>>
>> Radio Shack is actually one of the cheapest sources of
>> such transformers.
>>
>> Adding a line cord, a duplex outlet, and some sort of
>> project box to put everything in, the cost of a
>> bucking arrangement is going to be less than $20 for
>> one capable of handling 3 amps (which is plenty for
>> virtually all receivers and many of the lower powered
>> transmitters).  This compared to $85.68 for 250 feet
>> of "zip" cord.
>>
>> Since many electric companies try to maintain 125
>> volts +/- 2 volts (the "+" side definitely during the
>> warmer months with air conditioning load) using a 12.6
>> volt "bucking" transformer will drop the line voltage
>> to between around 115 and 111 volts depending on just
>> how high the line voltage.
>>
>> Glen, K9STH
>>
>>
>> --- jeremy-ca <km1h at jeremy.mv.com> wrote:
>>
>> As I said already, it is simply another option. What
>> is better for you may not be for someone else. Thats
>> why they made strawberry ice cream.
>>
>> Yes the zip cord output varies with the load but the
>> load from a radio is constant. It is simple enough to
>> calculate the load for 1, 2, 3 or more radios and use
>> a compromise length for a nominal 117 for one radio
>> and dropping down a bit as others are added. Wire
>> resistance and current charts have been in the ARRL
>> Handbook for 75 or so years.
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> Glen, K9STH
>>
>> Website:  http://k9sth.com
>>
>>
>>
>>
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